If you are worried for her, then hook her up with a Bible (or if you cannot afford, then with a website where she can read such as
www.biblegateway.com) and encourage her to read the Gospel books for herself, maybe suggest one to her to start with like the book of Mark, since it is short and to the point, and also covers baptism. And let her know that if she wants to discuss it with you, that you will always be happy to talk with her about the scriptures she reads. Then pray for her.
The rest is between her and God, ya know? You can't force her to think or believe anything, or to do anything, but if she is moved to understand for herself, and you give her an easy, straightforward way to get started, then you have done what you can.
Try not to let it get under you skin if it seems like she was taught false or incomplete things, divisiveness between believers is no good. There are plenty of people out there who do and say hateful, false things and claim it is in the name of God, so when put in perspective, your potentially confused but well-meaning friend is among the least of possible offenses out there. Just give her a little nudge and a friendly ear if she needs to talk, hook her up with the Gospels and let her approach on her own.
Per the Gospels, Jesus baptizes people with the Holy Spirit, though Jesus Himself was baptized in water. Many people want both, which I feel similar for myself, but also remember the thief on the cross next to Jesus was never baptized in water, but Jesus saved the man, anyway, because Jesus baptize with the Holy Spirit. So it's possible for different people to get different messages from different ministers, depending on interpretations, etc.
Which is why if she really cares and wants to know, she will look into it for herself, yeah? So hook her up with the scriptures, and leave it between her and God, whether or not she desires to know for sure, for herself. And then be a friend if she has questions or wants to talk about it. Sounds like she has good intentions and desires to be saved, so she is way ahead compared to most people already. So I'd say forgive her on any semantics-disagreements and encourage her to keep reading/exploring.
Oh well if she is 40/50/60+ years old or her first encounter with religion was 40+ years ago, some people are late bloomers, some people take a good while to fully understand, some people never do but at least have the very basics, have faith, which counted a lot to Jesus in the Gospels.
So don't be all freaking out lol, hook her up with the scriptures, be a friend, pray and trust God. Maybe offer testimony of your own experience repenting and being born again in Christ, in a friendly, conversational way, to give her something to consider/compare, see what she thinks.